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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Derivative [Line Items]            
Average days from the date of receipt in which funds remain as restricted cash and cash equivalents       60 to 90 days    
Reduced pledge collateral $ 375     $ 375   $ 555
Amount paid to settle the qui tam matter as restricted cash     5,200      
Inception date of derivative agreements       Jun. 30, 2009    
Debt inception dates       Apr. 01, 2009    
Debt maturity Dates       Mar. 01, 2016    
Loss on derivatives included as a component of other comprehensive income, net of taxes       95 53  
Interest expense on derivatives related to credit risk       3    
Reduction in revenue due to scholarships offered to students       65,563 51,963  
Percent of financial aid earn by student       100.00%    
Period for write off inactive student accounts         150 days  
Arrangement expense 640 151   1,681 612  
Due to related parties 328     328   227
Mind Streams
            
Derivative [Line Items]            
Due to related parties 322     322   212
Interest Rate Swap
            
Derivative [Line Items]            
Interest rate receivable on interest rate swap amortizing notional amount 30 Day LIBOR     30 Day LIBOR    
Inception date of derivative agreements       May 01, 2010    
Maturity date of derivative agreements       Apr. 30, 2014    
Notional amount of interest rate swap 9,985     9,985    
Fixed Interest rate payable on interest rate swap amortizing notional amount 3.245%     3.245%    
Pledged collateral as non current restricted cash 375     375   555
Amount of derivative ineffectiveness for the interest rate swap       0    
Interest Rate Swap | Designated as Hedging Instrument
            
Derivative [Line Items]            
Fair value of interest rate swap is a liability, which is included in other non current liability 465     465   629
Interest Rate Corridor
            
Derivative [Line Items]            
Interest rate receivable on interest rate swap amortizing notional amount 30 Day LIBOR     30 Day LIBOR    
Inception date of derivative agreements       Jul. 01, 2009    
Fair value of interest rate corridor included in other assets 1     1   1
Maturity date of derivative agreements       Apr. 30, 2014    
Notional amount of interest rate swap $ 9,985     $ 9,985    
Interest rate payable on interest rate corridor if 30 day LIBOR is less than 4% 30 Day LIBOR     30 Day LIBOR    
Interest rate payable on interest rate corridor 30 day LIBOR equal to 4% through 6% 4.00%     4.00%    
Interest rate payable on interest rate corridor 30 day LIBOR exceeds 6% 30 Day LIBOR less 2%     30 Day LIBOR less 2%